1  
   2  public partial class ViewCustomers : System.Web.UI.Page, IViewCustomerView
   3  {
   4  	private ViewCustomerPresenter presenter;
   5  
   6  	protected override void OnInit(EventArgs e)
   7      	{
   8          	base.OnInit(e);
   9          	presenter = new ViewCustomerPresenter(this);
  10          	this.customerDropDownList.SelectedIndexChanged += delegate
  11                                                                    {
  12                                                                    	presenter.DisplayCustomerDetails();
  13                                                                	  };
  14      	}
  15  
  16  	// ...
  17  }
  18  
  19  public class ViewCustomerPresenter
  20  {
  21  	private readonly IViewCustomerView view;
  22  	private readonly ICustomerTask task;
  23  
  24  	public ViewCustomerPresenter(IViewCustomerView view) : this(view, new CustomerTask()) {}
  25  
  26          public ViewCustomerPresenter(IViewCustomerView view, ICustomerTask task)
  27          {
  28              this.view = view;
  29              this.task = task;
  30          }
  31  
  32          public void DisplayCustomerDetails()
  33          {
  34              int? customerId = SelectedCustomerId;
  35  
  36              if (customerId.HasValue)
  37              {
  38                  CustomerDTO customer = task.GetDetailsForCustomer(customerId.Value);
  39                  UpdateViewFrom(customer);
  40              }
  41          }
  42  
  43          private void UpdateViewFrom(CustomerDTO customer)
  44          {
  45              view.CompanyName = customer.CompanyName;
  46              view.ContactName = customer.ContactName;
  47              view.ContactTitle = customer.ContactTitle;
  48              view.Address = customer.Address;
  49              view.City = customer.City;
  50              view.Region = customer.Region;
  51              view.Country = customer.CountryOfResidence.Name;
  52              view.Phone = customer.Phone;
  53              view.Fax = customer.Fax;
  54              view.PostalCode = customer.PostalCode;
  55          }
  56  
  57  
  58  
  59  	// ...
  60  }
  61  
  62  public class CustomerTask : ICustomerTask
  63  {
  64  	...
  65  }